1.在form中添加一个NotifyIcon控件     
 
2.把87.ico这个图标放在\bin\Debug目录下  
 
using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Text;  
using System.Windows.Forms;  
 
namespace 将程序最小化到系统托盘  
{  
    public partial class Form1 : Form  
    {  
        public Form1()  
        {  
            InitializeComponent();  
        }  
 
        private void Form1_Load(object sender, EventArgs e)  
        {  
            this.notifyIcon1 = new System.Windows.Forms.NotifyIcon(this.components);  
            notifyIcon1.Icon = new Icon("87.ico");//指定一个图标     
            notifyIcon1.Visible = false;  
            notifyIcon1.Click += new System.EventHandler(this.notifyIcon1_Click);  
            this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged);     
      
 
        }  
 
        private void Form1_SizeChanged(object sender, EventArgs e)  
        {  
            if (this.WindowState == FormWindowState.Minimized)//最小化     
            {  
                this.ShowInTaskbar = false;  
                this.notifyIcon1.Visible = true;  
            }     
 
        }  
 
              private void notifyIcon1_Click(object sender, EventArgs e)  
        {  
            if (this.WindowState == FormWindowState.Minimized)  
                this.WindowState = FormWindowState.Normal;  
            this.Activate();  
            this.notifyIcon1.Visible = false;  
            this.ShowInTaskbar = true;     
 
        }  
 
    }  
} 

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/hanghwp/archive/2009/06/12/4263233.aspx